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whether there may be life on mars. nasa scientists say the red planet may once have been habitable. they say their rover curiosity has found the ingredients to nurture life and evidence of a vast amount of water. >> i think we have found a habitable environment that is so benign and supportive of life that probably if this water was around and you had been on the planet you would have been able to drink it. >> curiosity drilled last month in search of rock. nasa scientists used the vehicle's observation instruments to analyze the samples. they identified sulfur, nitrogen, phosphorus. some of the chemical ingredients for life. they always found the area the rover searched had a vast amount of water and was almost ph neutral as water is on earth. curiosity landed on mars last august after a 36-week journey through space. scientists are operating the rover by remote control. they've spent the past seven months looking for any trace of life on the red planet where the surface temperature can drop below minus 120 degrees celsius. curiosity transmitted clear pictures of mars' terrain soo
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